Revert "yarn upgrade; aka I'm feeling lucky."

This reverts commit 8eb658c.

Author: ximon18

package.json

@@ -26,9 +26,8 @@
     "http-proxy-middleware": "^0.20.0",
     "idle-vue": "^2.0.5",
     "ip6addr": "^0.2.3",
-    "is-svg": "^4.2.2",
     "moment": "^2.27.0",
-    "prismjs": "^1.23.0",
+    "prismjs": "^1.27.0",
     "scryptsy": "^2.1.0",
     "typeface-lato": "^0.0.54",
     "typeface-source-code-pro": "^0.0.71",